Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P2271secondary HO2S [sensor 2] circuit signal stuck rich
P2271O2 SENSOR 1/2 OUT OF RANGE LOW
P2271secondary HO2S [sensor 2] circuit signal stuck rich
Manufacturer communications
6Original wording in English
ACURA
Servicenews article - Is the MIL on with DTC P2271 (secondary HO2S [sensor 2] circuit signal stuck rich)? What's likely causing this is the PCM is misinterpreting the A/F sensor (sensor 1) signals, causing the PCM to think that sensor 2 is stuck rich.
ACURA
Tech line summary article - Is the MIL on with DTC P2271 (secondary HO2S [sensor 2] circuit signal stuck rich)? What's likely causing this is the PCM is misinterpreting the A/F sensor (sensor 1) signals, causing the PCM to think that sensor 2 is stuck rich. To fix this issue, replace both sensors.
HONDA
Tech line summary article - Is the MIL on with DTC P2271 (secondary HO2S [sensor 2] circuit signal stuck rich)? What's likely causing this is the PCM is misinterpreting the A/F sensor (sensor 1) signals, causing the PCM to think that sensor 2 is stuck rich. To fix this issue, replace both sensors.
LAND ROVER
"ISSUE: THE CUSTOMER MAY OBSERVE A MIL IN THE INSTRUMENT CLUSTER RELATING TO THE ENGINE SYSTEM (CHECK ENGINE LIGHT) AND ONE OR MORE CODES STORED IN THE PCM RELATING TO HEATED OXYGEN SENSOR (HO2S) IN THE EXHAUST SYSTEM. THE CODE WILL REFER TO A FAULT WITH THE PRE, OR MID, OR POST CATALYST HEATED OXYGEN SENSOR: P0030, P0031, P00D1…
Check vehicle applicability
20A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Acura | TSX ↗ | 2008 |
| Acura | TSX ↗ | 2007 |
| Dodge | RAM 2500 ↗ | 2012 |
| Dodge | RAM 3500 ↗ | 2012 |
| Honda | ACCORD ↗ | 2007 |
| Honda | ACCORD ↗ | 2006 |
| Honda | CR-V ↗ | 2006 |
| Honda | CR-V ↗ | 2005 |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.